How is blood formed?
The human blood consists of plasma, white and red cells. Plasma is a yellow liquid substance made up of 93% water and 7% of organic substances (proteins, fats and carbohydrates) and inorganic salts (magnesium, potassium, calcium, sodium, bicarbonate, phosphate, chlorine). In plasma are suspended various types of cells: red blood cells (or entrocitos) that carry oxygen, white blood cells (or leukocytes) of various types, each with a different function, which are responsible for the system the body's defense, and platelets. The blood pumped by the heart, circulates throughout the body through arteries and veins. In the lungs, carbon dioxide leaves the body takes and absorbs the oxygen that leads to all cells of the body.
Coagulation is mainly due to the fibrin strands which trap blood cells.
Landsteiner in 1930 received the Nobel Prize for his studies of the four blood types: A, B, AB and O. In addition to the RH factor group there may be positive or negative.
Why are blood clots?
The blood coming from a wound on contact with air coagulates, forming a dense mass that stops the bleeding. This is due to the action of a substance called fibrin, produced in the liver.
In a drop of blood can be seen the red blood cells, very small, including some larger white blood cells.
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